Which one of the following components might be available separately in uniside repair?

In uniside repair, which refers to the repair of a vehicle's unibody structure following damage, specific components can typically be replaced or repaired separately rather than requiring the entire assembly to be changed. Among the choices provided, the pillars are structural components that can often be accessed and replaced independently.

When a vehicle experiences damage to one side, technicians may focus on repairing or replacing the affected pillars, which provide structural integrity and support for the roof and body of the car. This ability to replace the pillars separately is advantageous in terms of both cost and repair time, as it allows for targeted repairs without needing to replace larger sections of the vehicle's structure.

In contrast, components such as the chassis, headlights, and transmission are generally not isolated in the same way. The chassis forms the main structure of the vehicle and is part of a larger assembly, while headlights are typically replaced as units and may not relate directly to the unibody’s structural integrity. The transmission, being a major mechanical component, is usually involved in larger repairs and is not typically a focus in uniside damage situations. Thus, pillars are the most relevant choice in the context of uniside repair due to their role in the vehicle’s structural system and the possibility of being replaced